ਜੌੜੇ: ਰੀਵਿਜ਼ਨਾਂ ਵਿਚ ਫ਼ਰਕ

ਹੇਸ ਵਿਖੇ 8,220 ਵਾਰਨਿਕ ਤੌਰ ਤੇ ਪਾਏ ਗਏ ਜੋੜਿਆਂ (ਜੋ ਕਿ, 4,110 ਗਰਭ-ਅਵਸਥਾਵਾਂ) ਦਾ 15-ਸਾਲ ਦਾ ਇੱਕ ਜਰਮਨ ਅਧਿਐਨ 13.5 ਮਿੰਟ ਦੀ ਇੱਕ ਔਸਤ ਦਰ-ਵਾਰ ਅੰਤਰਾਲ ਪ੍ਰਦਾਨ ਕਰਦਾ ਹੈ।<ref name="acta">{{Cite journal|last=Stein|first=Werner|last2=Misselwitz|first2=Björn|last3=Schmidt|first3=Stefan|year=2008|title=Twin-to-twin delivery time interval: influencing factors and effect on short-term outcome of the second twin|journal=Acta Obstetricia et Gynecologica Scandinavica|volume=87|issue=3|pages=346–353|doi=10.1080/00016340801934276}}</ref><ref>There were 836,104 deliveries of babies in Hesse over the 15-year study period, including 11,740 twin pregnancies, of which only 4,110 met the inclusion criteria and hence were examined in the study. The excluded twin pregnancies were in cases of (1) delivery before 34 weeks of gestation; (2) when the first twin was delivered by [//en.wikipedia.org/wiki/Caesarean_section caesarean section]; (3) when either of the twins had died in the womb before the onset of labor; and (4) when the pregnancy had been complicated by fetal malformations or [//en.wikipedia.org/wiki/Twin-to-twin_transfusion_syndrome Twin-to-twin transfusion syndrome].</ref> ਜੋੜਿਆਂ ਦੇ ਵਿਚਕਾਰ ਡਿਲਿਵਰੀ ਦੀ ਮਿਆਦ ਨੂੰ ਹੇਠ ਅਨੁਸਾਰ ਮਾਪਿਆ ਗਿਆ ਸੀ:{{Reflist|30em}}